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by kennethh 4305 days ago
I checked it out myself and you can decide for yourself which type of instance you want to deploy. The default was micro (the cheapest) and 3 nodes.

Cited from the setup page:

This interface allows you to deploy one or more MongoDB server nodes and one or more arbiter nodes as part of a single MongoDB replica set. By default the replica set will contain 2 data-bearing server nodes and 1 arbiter node.

A short-lived "Deployment Coordinator" Compute Engine instance will be created to manage instance setup.